Comparison of regional and gobal GRACE gravity field models at high latitudes

Comparison of regional and gobal GRACE gravity field models at high latitudes

Gunter, B.C.
Wittwer, T.
Stolk, W.
Klees, R.
Ditmar, P.

Aerospace Engineering

Remote Sensing

2009-09-04

In this study we address the question of whether regional gravity field modeling techniques of GRACE data can offer improved resolution over traditional global spherical harmonic solutions. Earlier studies into large, equatorial river basins such as the Amazon, Zambezi and others showed no obvious distinction between regional and global techniques, but this may have been limited by the fact that these equatorial regions are at the latitudes where GRACE errors are known to be largest (due to the sparse groundtrack coverage). This study will focus on regions of higher latitude, specifically Greenland and Antarctica, where the density of GRACE measurements is much higher. The regional modeling technique employed made use of spherical radial basis functions (SRBF), complete with an optimal filtering algorithm. Comparisons of these regional solutions were made to a range of other publicly available global spherical harmonic solutions, and validated using ICESat laser altimetry. The timeframe considered was a 3 year period spanning from October 2003 to September 2006.

http://resolver.tudelft.nl/uuid:5a471644-e32e-4033-b322-c91b4d5ff296

https://doi.org/10.1007/978-3-642-20338-1_21

Springer

0939-9585

http://www.springerlink.com/content/w520743hm26v8l15/

Geodesy for plate earth; proceedings of the 2009 IAG symposium, Buenos Aires, Aug.31-Sept.4 2009 International Association of Geodesy Symposia, vol.136

Institutional Repository

conference paper

(c)2012 The Authors, Springer-Verlag